While best known is its use in the petroleum industry for pressure testing pipelines and containment vessels, nitrogen is also popular for leak testing in a range of other industries. That would put me at about 400psi for the pressure test. Automotive A/C Nitrogen Leak Detector Kit. I was reading that you should test at 1.3x your max working pressure. Do not exceed the system working pressure with nitrogen. 4.5 out of 5 stars 167 $55.99 $ 55 . Remember, the gas laws work with all gasses. Not easy to get where I am from. Use dry nitrogen to push some of the contaminants out of the system by simply attaching the nitrogen regulator to one of the lines and allowing it to blow out the other. I am restoring the A/C in my 1969 Chevy truck and going to put R-12 back in the old thing. When performing a pressure test, it does not have to be does with pure nitrogen in the system either. I seen a YouTube video with a tech "flowing nitrogen in the low side and reading system pressure on the high side. Nitrogen and refrigerant form a new gas with additive pressures. Leak testing using oxygen free nitrogen (OFN) Nitrogen has a molecular structure which makes it suitable to find most leaks, and in addition it is reasonably priced. 1/4 SAE flare outlet port, with control valve, to keep pressure on the regulator at all times Thank you Then, nitrogen with a little refrigerant is introduced after the leak is fixed to test it with your leak detector. I know we was taught to nitrogen to pressure test a system for leaks. As Mike mentioned above- I also saw reports of the service valves not holding and letting nitrogen into the outdoor unit when testing at 500+ psi pressures- don't want to go there. The trace of refrigerant in the system remains a gas. 99 Because nitrogen is held under greater pressure than the coolant, leaks create an audible hissing or whooshing sound as it exits the system. Without compressor in the system, you can safely use 250 psig for high pressure refrigerant systems. Would there be any problem using another gas like carbon dioxide? I feel better with that vs. 550psi. With the gas law equations, we can know what the pressure in the system should be and eliminate time wasted looking for leaks that aren't actually there. Easily pre-check systems for leaks due to loose mechanical connections, hose leaks, evaporators and condensers without using refrigerant and venting into the atmosphere. We pressurized to 350 PSIG at 90F, and it's now 65F. In this test, an AC/R professional will remove all refrigerant from the unit, replace the gas with compressed nitrogen, and listen for any sounds. Nitrogen Pressure Tester for R-134a and R-1234yf. It's a Icp heat pump with a hard shut off TXV. SA - Nitrogen Gas Regulator 0-600 PSIG - HVAC Purging - Pressure Charge - 1/4" Flare Connector - With 60" Charging Hose. On one system I was installing I set up the standing pressure test with nito and 22 tracer, found a small leak at one of the joints with the D-tek, it was late so I packed it in for the day and came back th next day, the gauge was still exactly at the same pressure as when I left, it showed me the benefit of using electronic leak detectors. This single-stage nitrogen regulator is used to test systems for leaks when they do not contain refrigerant. This using nitrogen to 'find' leaks is the most expensive way of doing it. Nitrogen is used for testing, usually, after the system has been opened and a leak has been repaired. Nitrogen pressure tester is designed to meet the specifications of automotive A/C systems. Nitrogen is utilized within numerous industries for leak testing. It will work with a mixture of nitrogen and a trace of refrigerant as well. IMPORTANT: DO NOT exceed the recommended pressures (use a pressure regulator) and DO NOT operate the air conditioning system with oxygen free nitrogen (OFN) in the refrigerant circuit. So I don't want to chance messing things up and loosing the R-12. Just recently have been working on a 410a system and want to pressure test with nitrogen. Before we get excited, let's look at how the temperature change affected the pressure within this sealed system.
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